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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b92c4362d941df4883bf23cbebed6aa3e57be4408c8d34698fb5eaa6ac7379f' 
  AND token = '5ySifZO0rUS81BFG8F8fBINg8AXINxpcQ8M5NXXT9WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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