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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7eef81f4ef5ca429480554b31c24c3000bd734780ded4ddc17986de1be78a0' 
  AND token = 'KiETM7ZiesL03KkJipd3eB8mjKW/nsuCY9zFb3orcDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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