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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfcd02e7377bcc3a3e478407e27ce07d30f47c5186465f7ea00597a805a864a' 
  AND token = 'cNzrdGCY5Ea41YvvgaMeEg488r/nh/AiyxEjXSLyggg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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