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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c1c6d78101c4ec137e9c04d033aad3c51cb29350450c8b2ae39ac8e8ca4a3b' 
  AND token = '4BgrBdDSHXlQz6mkqT0gEnu9NMuoqknbB9/LEOamf6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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