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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '649b30658039904caecb34a9ce1d6a71a5757d077091d76a25643a1d067eeec3' 
  AND token = 'qC9y+P7K2ch/J7NmtSNa+zwxNjeYpf57RZ0hcwW3S6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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