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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d35eaaf5a00ab491954ffbd7e7b7597daf7e09862dbc403c4975008cfb20f1e' 
  AND token = 'ZRJ3rmYTpFaZ2wEVnS10ewBgYfgMxOKw7W4qIVD8x94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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