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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3995c3dd4cfe82d0a44fe45966efdde2f28d35c10a0f2c61845f272e4c86ed4' 
  AND token = '8rxy1vp0PjtfmXQ2w5pTVcyk4PUqjarv9YTUP9xKMLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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