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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c817e893bccc92daf78feef2a5401d853d8edd484884b74458d7b427be0fe1a3' 
  AND token = 'Ixl0nUz4AMQA226vqFUtyIb8mqw6D8HVdb6AKWetNAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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