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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64e9501ee6823455f11cc5700993590d5e17ce559231095ba71583d8d5492fb9' 
  AND token = 'aoSrojsqfElK3GOkfnDs2bu7q1Y45T+4s57Xn3YUXdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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