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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daab3e136dcd0d532d23ac242758191e3d7c33532e90bf52c4834a2264a55ddf' 
  AND token = 'J8xo3vuO9aq1q6Qf7+Pr7K3G2E2TlSIeL+nL/ybZsJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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