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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03753b2b1dfc0319eb043c78607a99bd5220cf242a5b6a0c4d5dc6eebf38953' 
  AND token = 'jjqqryeh6l0fv7nDEghoIJO7sPdk+K/0IiiUxIACq2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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