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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eac0be213dfe60b6b99df61794d4acf2c6333ef4292cf1a6d90821a59a5f4b2' 
  AND token = 'KSekBxZSj903UmbkLxgX2NgD9sK4sGKSMI9NWn6BZek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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