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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc87b986cd575afa7b5dcb131c49050271e20b3b1f2989173ed98c455dae3053' 
  AND token = 'dWnra0Lj1JI1N5YxFlxUzwdotLjVYuTYrHUoX6t81Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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