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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155c6660100db028b2ce7ae66b66f819b9b85a20c4d9fbd4f488dd70e3e06461' 
  AND token = '0pFBGn1uadRgYUPJrqoDLWd1VVcoq6fFzNZqt88IsrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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