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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf41a67b87730fdecf22c3f96dcd25e23c19c13e67815b871cfe429dcba2b7a' 
  AND token = 'hiEFC+7+gBBosvsn7Lw6CR03OvQqr/vr8cy0sRuZWTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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