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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70936414b06dcfdca4c2839cf37a4a458b0eb9c8c8ca9d4bfa6cde40834fb06' 
  AND token = 'T2Skuj6tERXlI6JWX0f7A80RMlLc79WyM8a1Vvde+uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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