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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a236fd2c167adf4ca3612983b2892d4b248870c1f240ca274760b0a31985723' 
  AND token = 'betzodkqXiqc9W7k/zMTldKhobeczbuPCis3dfoK2rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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