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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2b88ac67828bcd3fbb965bfdea46d1d61d27cde0d9d048ae0174bd26f11962' 
  AND token = 'b3k6PkgfAuFbMB557hcblVPmtRy9oL7eF3RRWwmXajY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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