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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eaa9493e53c6ebb387bec0c89128c5d9d4874854bd9629b0e2f8a04812309a0' 
  AND token = 'hm8jCRDrqjw2IO10z4bgk/7yc2Vr6TacxEH5gnBF2js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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