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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d71ebae3dbf3aeb7639e2425aa690159447a2e87c6832b50a7f64cd078c5a0' 
  AND token = 'Toi6X9efck5L1ilQjzwWYdH00FDYNU2shi4UwGh0q48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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