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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb99bf10ea4ae00db73c3c2837dd193e6c5e6080c08396daa0409638a59e55fd' 
  AND token = 'GbWmgeVQdCLd7BUUi3vAzZ2NS39yfJ9NKVdKnX4u8ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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