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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fa5866beabd7f6a3379a0d386357ca98adc7c47e4c611181cd59db167f8f64' 
  AND token = 'Kn86yipsYp7v/fCu6I/R7/jp51p4g+/eTvulufjSjHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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