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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6720e46b3df7164698a756f2bef02db31c84d11bf456bb942dbce498aa39af' 
  AND token = 'CvL4qrWTyWtp3Mrunyre7p+AMtjOZZeci/tntYsarP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}