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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fb4fe8022582038e6af43bad2d34beb674fc7512dcb3f73bb6d59630cc7ddb' 
  AND token = 'EYIgZs04bpwPvXSEn9YfLm/rbGKQDhzld0MotgYaShk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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