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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5ca5f81cda94044f1d31f9c243ca03c3b9bc5ce37d9d6d8f0201bc91fdc34f' 
  AND token = '/Ej7OFXTfaLAWgqXIQ6IDfTC90GufDLCwICCP97q0Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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