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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0f735ed445d5451411e7ae4e7326677f70c73443f56f04593faf71d10fc5ed' 
  AND token = 'i7RokQVjJtqjz60C8ra2GxSdkJ95JewULdOOcy31Xm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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