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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7efc0f1b287492c89a50c22deb89a83c8efc55f1db978c8c4eb94db1ffcf8707' 
  AND token = 'U3Iwhc+cmrzPxuM1Ktj8i8q9mr6iTxvg4OFkTgotDb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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