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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c6531e649fba47e2e9d244c26baa94e7f37b3da0c083f3a6327ccf79b9f654' 
  AND token = '0RpBpe4jina+O7wAPDyYeEf87bi2fLUBDXX/ZNOyqvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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