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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e0a56ab945dd904798673f28bf5b28e09ed8dfc8a2f925be0c4daf5de15c9f' 
  AND token = '4JY5EeKhs4R5KlVmMqZdvzkgrHhqoo50imIupShoz80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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