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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d235b6a925fc530096f8eef33bc19c174e38efb260d491e44a062f0279eef5' 
  AND token = 'J5NVHJ9r8/oYgpDGH0r5ZfCrqFFZjQvjac3/u93Yl1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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