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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf072d4489b65677c6b2fb091974e6ba0fba3cce8871c072b74b418cb4547f9' 
  AND token = 'zfXI28Sr/HxlwN3+EanLIN4EgP2cL+8gNNeZB9rBFSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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