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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711810f659e5484376cd179e4b90831b048b5456f15d8f9bf96ffa959524bfa3' 
  AND token = 'StxZ3roXeH74iHlCwc1Uu4/6xkp4/onySPDgF9aj8dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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