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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b4214dac6ed85b71538c9ae0a6ef67db44e5e9ea26716ad2f0ce4fa350b412' 
  AND token = 'rgoPxU3uwnarNhvtW/QB/nJQ32JPTi6j20WjR6M25J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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