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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ffa72e3a7edccebf7c775351eac0edccc94cd0b4f69d96faf60fdd5aef061a2' 
  AND token = 'Cyt3YGFEiy9/8cJeuP8CcQoGAtxG7FAVaiVpw0wvsqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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