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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0886760b9a5eb768dbc70a1d85bccec6d77beea9a315a44b211770a5da47829e' 
  AND token = 'yQqMn7A9t2BGYGZ5MndC2gaPu6WjkXBH6YKD23vB8qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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