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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da67ab5652da81040866cc0296710134d6d5254dc3623ec2aa1e87b8387795a' 
  AND token = '5YrwZFB5jHzaS1MKtxaBhd5SU+TCczT1IgH0N3S7Od4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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