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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e70251b0e53c2f40da565aa764bc77168a8ca2e8bccba056cd66a6e1089abf9' 
  AND token = 'XMCcBJ3dYx5ChAwXmVuHgijqNR7MD/Rc3L3b68rt+/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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