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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdc2c6405d8f40b4965f0c6996d005085617b0a4ee747efc9c1495ca2ab06b3' 
  AND token = 'scypwkenZAYPTL1erNPa0wlXSfstrlCM7fW5wTQzwF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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