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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671e59943638a4a3953e0ef0f13ae14b2d377b77b4156cf79b971b713f1f2265' 
  AND token = 'Gw5PeGAz3w/TSsYrN4w151Ciun7G7vHnXAV4krzwoBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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