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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d0b29b0b59bb27cd290701ab81dcf1c5a08a5e50e0c4c3ccdb1c90258dfcae' 
  AND token = 'Ep6ohwlLvnxVTR7FN0lCKrbJmr7LwZ6PFwmuONv1alE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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