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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dd57a2e7ac3fd6f63704a1fe614610e0a3a1537b05f2b5c9e6c5d1f2bdf6dc' 
  AND token = 'iMD9ejrLmDe6RGk/Dh6IvfujmLG2p9QmlAaRI12wQ6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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