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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77e2095b2f16c341ab3a959e23e203661cd177de72ac7f723ea27746ec60da2' 
  AND token = 'Ret4ndkujMDr+hSgSnAc+vMYdmbX4cmPcT4914HHmB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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