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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27425f60f3f1dc9a9e49ed0174e02a06780b628350cad21dad72f0782c824e55' 
  AND token = 'XeL4Xk0NiAj/PagtegaffwSqoNeBDL+gLhYCmQuRMFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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