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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31531c2323ecff4428a1a39c8996aa5f810f51edeb545411922a692bbc952458' 
  AND token = 'JV4SrMVV0GtHNrO14tvqEHQnMs29gEFMzgrUsWJnC/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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