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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae41f449805c4761a4ac58001773c388332d4fa483845d9c0601a9ae104f689' 
  AND token = 'KnVvFTcqd5pn73gsL8OmjSzg0d45EyAPszFm+Tc7zh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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