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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbaecc8eddf31c58664ded9ce6668673d9f111005df13bdd0656ce01854ffdb5' 
  AND token = 'OvWEMRXfktG8jtzE5Jf8O9CAM2tWv1c+HQh7XbjO9E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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