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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb94d74268d93d2c601c8423013bc227a30c3132d0f82f5ea08d34ccdd5e288e' 
  AND token = 'Cp9Ur69vJxidaQ0Lww6k1jYJt9CVBG0A06WMEP/IWGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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