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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b123199f44f5feaa8bb33fab2d0ad91e1f3a20efe98e6ba456f5c1e8110e60' 
  AND token = 'o+Tly2QNZnSotHY4lEwlwmBoTf0NvhPrwTT3ZmVEcjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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