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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd010df42c389c43c33c7cd3e21946b91d4a128c2e521c8a53b9df9e534344f32' 
  AND token = 'HQC2YJq7iddhHMcgTpR1K1J0dUcCX+ZwTszjl7nE3es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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