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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5697a8f8b7cea5f66379a3f89fed68e4c3a1c39c479d81f729be7f4be6bada7' 
  AND token = 'N/Vu7TBskfsR8324MFAqkxqGX2nV2l6du5fuK+AxxEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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