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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbdfa6cac6432da5f38d5f35fb06b7c76ed8e0a1a7b2c4e0ffdfe41b2e99191' 
  AND token = 'C8M7L3iC9M7fmBNeJ/J5uX/qWHbC7tL8z7STG1DICdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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