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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa27f1ec0679eb2a9b75c5aab4feefc22572ac0330ee0fb28f590f5e1b898ed' 
  AND token = 'Mg5IJTfizznn+j9zDD4nobMob9A5QRTiLRREDk+WNt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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