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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccf35a8af71d20923e1d6453803e5b36d8bc1dd5dccef562dde75a7c80562c4' 
  AND token = '/g6zl5g+/XoCJTwL35VetHhQeKiTJPrydClLZ99UQ4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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