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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afeac2e2853e000fa6b5deba270b0d14be70915443c8d70699ce3343a574d72' 
  AND token = 'M5ulm3BjWFqcrEZaM94adE23m+24HD9qSUYWs67fawU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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