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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f461265c95f59a0db0c78411b5e0b37ad0550e7a3f3510aa93e0617e9e8521f9' 
  AND token = 'cNSeZ9cVLuKB8hcZfOlB5n0ioc1yuPqfqxZUlzFu9T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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