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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0409799541e3a2f781ec4bc43b0a0423fe360609b2a21fe062a340a6284f272' 
  AND token = 'glVeAdlpMVj4j1oXDczjMn+9Q/UW/Lj3JoagdbX52mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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