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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f2de657c068767e7ba3fd2d45331ab00eb889755b887f5b6d9b78bb14c7e3f' 
  AND token = 'zpTHacRhd9WScLj0mfRw+U4h+G2ToFkOL5UczesH4K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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