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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937e0456cd38a95722a730b3e1edd737ace1e75d3ce9a09035bd806194ee543e' 
  AND token = 'HHwpuURrnNJSWlJnAr+qleVHq81H3Nag6t7pqUIipRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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